﻿using System;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Interop;

namespace 嵌入第三方应用程序
{
    /// <summary>
    /// PDFwindow.xaml 的交互逻辑
    /// </summary>
    public partial class PDFwindow : Window
    {


        public PDFwindow(string filePatch)
        {
            InitializeComponent();
           // String path = @"D:\Program Files\Notepad++\notepad++.exe"; //VusionDTI  ImAgenGine_MRDP
            EmbeddedApp ea = new EmbeddedApp(border, 100, 100, filePatch, @"D:\install.log");
            border.Child = ea;
            Thread.Sleep(10000);
        }
    }


    class EmbeddedApp : HwndHost, IKeyboardInputSink
    {
        [DllImport("user32.dll")]
        private static extern int SetParent(IntPtr hWndChild, IntPtr hWndParent);
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern uint SetWindowLong(IntPtr hwnd, int nIndex, uint newLong);
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern uint GetWindowLong(IntPtr hwnd, int nIndex);
        [DllImport("user32.dll")]
        private static extern int EnumWindows(CallBackPtr callPtr, ref WindowInfo WndInfoRef);
        [DllImport("User32.dll")]
        static extern int GetWindowText(IntPtr handle, StringBuilder text, int MaxLen);
        [DllImport("user32.dll")]
        public static extern int GetWindowRect(IntPtr hwnd, ref RECT rc);
        [DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern int SendMessage(IntPtr hwnd, uint wMsg, int wParam, int lParam); //对外部软件窗口发送一些消息(如 窗口最大化、最小化等)
        internal const int
            GWL_WNDPROC = (-4),
            GWL_HINSTANCE = (-6),
            GWL_HWNDPARENT = (-8),
            GWL_STYLE = (-16),
            GWL_EXSTYLE = (-20),
            GWL_USERDATA = (-21),
            GWL_ID = (-12);
        internal const uint
              WS_CHILD = 0x40000000,
              WS_VISIBLE = 0x10000000,
              LBS_NOTIFY = 0x00000001,
              HOST_ID = 0x00000002,
              LISTBOX_ID = 0x00000001,
              WS_VSCROLL = 0x00200000,
              WS_BORDER = 0x00800000,
              WS_POPUP = 0x80000000;
        private const int HWND_TOP = 0x0;
        private const int WM_COMMAND = 0x0112;
        private const int WM_QT_PAINT = 0xC2DC;
        private const int WM_PAINT = 0x000F;
        private const int WM_SIZE = 0x0005;
        private const int SWP_FRAMECHANGED = 0x0020;
        private const int WM_SYSCOMMAND = 0x0112;
        private const int SC_CLOSE = 0xF060;
        private const int SC_MINIMIZE = 0xF020;
        private const int SC_MAXIMIZE = 0xF030;
        private const uint WM_LBUTTONDOWN = 0x0201;
        private const uint WM_LBUTTONUP = 0x0202;
        private const int BM_CLICK = 0xF5;

        private Border WndHoster;
        private double screenW, screenH;
        private System.Diagnostics.Process appProc;
        private uint oldStyle;
        public IntPtr hwndHost;
        private String appPath;
        public EmbeddedApp(Border b, double sW, double sH, String p, String f)
        {
            WndHoster = b;
            screenH = sH;
            screenW = sW;
            appPath = p;
            WinInfo = new WindowInfo();
            WinInfo.winTitle = f;
        }
        protected override HandleRef BuildWindowCore(HandleRef hwndParent)
        {
            hwndHost = FindTheWindow();
            //if (hwndHost == null)   
            //{   
            appProc = new System.Diagnostics.Process();
            appProc.StartInfo.FileName = appPath;
            appProc.Start();
            Thread.Sleep(5000);
            hwndHost = FindTheWindow();
            SendMessage(hwndHost, WM_SYSCOMMAND, SC_MINIMIZE, 0);
            //}   
            // 嵌入在HwnHost中的窗口必须要 设置为WS_CHILD风格    
            oldStyle = GetWindowLong(hwndHost, GWL_STYLE);
            uint newStyle = oldStyle;
            //WS_CHILD和WS_POPUP不能同时存在。有些Win32窗口，比如QQ的窗口，有WS_POPUP属性，这样嵌入的时候会导致程序错误   
            newStyle |= WS_CHILD;
            newStyle &= ~WS_POPUP;
            newStyle &= ~WS_BORDER;
            SetWindowLong(hwndHost, GWL_STYLE, newStyle);
            //将窗口居中，实际上是将窗口的容器居中   
            RePosWindow(WndHoster, WndHoster.Width, WndHoster.Height);

            //将netterm的父窗口设置为HwndHost    
            SetParent(hwndHost, hwndParent.Handle);
            return new HandleRef(this, hwndHost);
        }
        protected override void DestroyWindowCore(System.Runtime.InteropServices.HandleRef hwnd)
        {
            SetWindowLong(hwndHost, GWL_STYLE, oldStyle);
            SetParent(hwndHost, (IntPtr)0);
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct WindowInfo
        {
            public String winTitle;
            public RECT r;
            public IntPtr hwnd;
        }
        public delegate bool CallBackPtr(IntPtr hwnd, ref WindowInfo WndInfoRef);
        private static CallBackPtr callBackPtr;
        private WindowInfo WinInfo;
        public static bool CallBackProc(IntPtr hwnd, ref WindowInfo WndInfoRef)
        {
            StringBuilder str = new StringBuilder(512);
            GetWindowText(hwnd, str, str.Capacity);
            Console.WriteLine(str.ToString());
            if (str.ToString().IndexOf(WndInfoRef.winTitle, 0) >= 0)
            {
                WndInfoRef.hwnd = hwnd;
                GetWindowRect(hwnd, ref (WndInfoRef.r));
            }

            return true;
        }
        public IntPtr FindTheWindow()
        {
            callBackPtr = new CallBackPtr(CallBackProc);
            EnumWindows(callBackPtr, ref WinInfo);
            return WinInfo.hwnd;
        }
        public void RePosWindow(Border b, double screenW, double screenH)
        {
            double width = WinInfo.r.right - WinInfo.r.left;
            double height = WinInfo.r.bottom - WinInfo.r.top;

            double left = (screenW - width) / 2;
            double right = (screenW - width) / 2;
            double top = (screenH - height) / 2;
            double bottom = (screenH - height) / 2;

            //b.Margin = new Thickness(left, top, right, bottom);
        }
    }


}
